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Intellectual disability and epilepsy due to the K/L‐mediated Xq28 duplication: Further evidence of a distinct, dosage‐dependent phenotype
Author(s) -
Ward David Isum,
Buckley Bethany A.,
Leon Eyby,
Diaz Jullianne,
Galegos Margaret Faust,
Hofherr Sean,
Lewanda Amy Feldman
Publication year - 2018
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.38524
Subject(s) - xq28 , gene duplication , intellectual disability , mecp2 , x chromosome , psychology , epilepsy , genetics , phenotype , neuroscience , biology , gene , psychiatry
Copy number variants of the X‐chromosome are a common cause of X‐linked intellectual disability in males. Duplication of the Xq28 band has been known for over a decade to be the cause of the Lubs X‐linked Mental Retardation Syndrome (OMIM 300620) in males and this duplication has been narrowed to a critical region containing only the genes MECP2 and IRAK1 . In 2009, four families with a distal duplication of Xq28 not including MECP2 and mediated by low‐copy repeats (LCRs) designated “K” and “L” were reported with intellectual disability and epilepsy. Duplication of a second more distal region has been described as the cause of the Int22h‐1/Int22h‐2 Mediated Xq28 Duplication Syndrome, characterized by intellectual disability, psychiatric problems, and recurrent infections. We report two additional families possessing the K/L‐mediated Xq28 duplication with affected males having intellectual disability and epilepsy similar to the previously reported phenotype. To our knowledge, this is the second cohort of individuals to be reported with this duplication and therefore supports K/L‐mediated Xq28 duplications as a distinct syndrome.